Windows 7 officially launches today, but we've been testing, tweaking, customizing, fixing, and writing about this OS for a year now. We present here a guide to everything we've learned about the OS, from first install to final settings change.

Whether you've played around with Windows 7 during its beta or release candidate versions, launch day is finally here, and Windows 7 is finally ready for widespread, public consumption. This guide will take you straight through from system requirements and upgrading your PC to highlighting Windows 7's best new features to helping you hit the ground running with all of the awesome tweaks Windows 7 has in store for you.

Prep Your PC for Windows 7: When Windows 7 drops this Thursday, you can either spend many, many hours watching a progress bar, or you can boot into a clean, speedy system with that new-OS smell. Let's get your system set up for a proper Windows 7 upgrade.

Run Windows 7 for 120 Days Without Activation: The command line code (slmgr -rearm) that could be entered at the end of three different 30-day periods to give Vista 120 days without activation works just the same in Windows 7.

New features

Windows 7 Tells You Why You Can't Touch That File: Windows 7 doesn't just give you a wagging finger (and pretend-useful "Try Again" button) when you want to move or delete a file that's in use. It actually tells you which application is using the file.

Windows 7 Transfers Your Wireless Settings Easily: To transfer the settings for yourself, head into the Network and Sharing Center, click on Manage Wireless Networks, and then in the properties for your wireless network you'll find the link to open the wizard that will copy all your settings onto a flash drive.

How to Burn ISOs in Windows 7: Burning that ISO to a disc is as simple as: 1. Double-click the ISO file (or right-click and select Burn disc image); 2. Click Burn.

Windows 7 Makes UAC Less Annoying Than Vista: The biggest change in Windows 7 is the new User Account Control "slider" setting, where you can choose your own balance between annoyance and security—but behind the scenes, Microsoft reduced the amount of actions that will prompt you.

IE8 Can Proactively Close Crashing Tabs in Windows 7: The copy of IE8 found only in (Windows 7) has a "timer" that monitors new tabs as they open. If they aren't responsive within a relatively short amount of time, the browser will pop up and tell you this, possibly with a reason why, and ask whether you want to wait or kill the tab before it causes further problems.

The Taskbar

Click to viewAero Peek: Peek supercharges Windows' taskbar thumbnail previews, and lets you view, close, and switch between multiple windows by just hovering over the taskbar thumbnail, as well as pin programs to the taskbar permanently.

Pin Individual Folders to the Windows 7 Taskbar: Windows 7's taskbar lets you pin any running program to the taskbar for easy future access, but it treats folders like second-class sub-items of the Explorer icon. Create a fake "program" to pin individual folder shortcuts to your taskbar.

Get a Functional Recycle Bin on Windows 7's Taskbar: TechSpot's solution—creating a Quick Launch taskbar, removing its text and title, then bringing the desktop Recycle Bin icon into it—covers all the bases, and lets you place your Recycle Bin pretty much wherever you'd like on the taskbar.

Built-in Applications

Set Up and Use XP Mode in Windows 7: Windows 7's new XP Mode lets you seamlessly run virtualized applications alongside your regular Windows 7 applications—so your outdated software will continue to work.

Calculator: While mathletes, scientists, coders, and statisticians will appreciate Windows 7's built-in calculator's programmer, statistics, and scientific modes, everyday people will love figuring out things like hourly wages and mortgage payments without a spreadsheet.

PowerShell: (A) souped-up command line and scripting GUI that frees you, finally, from the limits of DOS batch scripts.

Backup and Restore Center: For the average user with both media and crucial file needs, Windows 7's default backup features look promising.

Windows 7 Guest Mode Creates Bomb-Proof Accounts: In the simplest terms, Guest Mode takes a snapshot of how a PC was working before the kid, friend, coffeeshop customer, or whoever else is using the Guest Mode account logs on. That user can't do much to alter the system, and whatever they can do, like dropping files on the desktop, is discarded when they log off.

Mouse and Keyboard Shortcuts

Click to viewAero Shake: When you want to focus on the task at hand on a desktop cluttered with windows, just grab the window bar of the app you want to work in and shake it back and forth to clear away the rest. Another shake will restore the background apps to their former state. You can also drag and drop a window to the edge of the screen to maximize it, and click on its top bar again to restore its previous size.

Snap windows to half screen size: ... Dragging a window to the top of the screen maximizes it. Following that, if you drag a window all the way to the left or the right of the screen, Windows 7 will display a glass overlay on the desktop. Let go of the mouse button and it will snap the window onto that overlay, which is half the screen's size—a handy helper for widescreen monitor owners.

Customize or Disable Windows 7's Action Center: Windows 7's Action Center does a great job of compressing all of Windows' update/alert/whatever notifications into one icon, but it takes some tweaking to make it show what you want, or disable it entirely.

Get the Old "Show Desktop" Back in Windows 7—Kinda: The short version: Create a folder, place a "Show Desktop.scf" file in there (either your standard Google-found kind or the script available at the bottom link), then right-click your taskbar to create a "New Toolbar" that points to that folder. Turn off the text and titles on that new toolbar, change the icons to large size, and then put your new one-button toolbar where you'd like.

Hidden Windows 7 Tool Troubleshoots Sleep Mode Problems: The report lists all of the devices that are causing problems with sleep mode, explains the different power saving modes your computer supports, and even gives you detailed information on your battery—invaluable information when your system takes forever to go in and out of sleep mode.

Disable the New Libraries Feature on Windows 7: Simply download, extract, and double-click on the provided registry hack file, then restart your computer and you'll see that the Libraries are completely gone. There's also an uninstall registry script provided just in case.

Xdn Tweaker Updates to Tweak Windows 7: If you want your system to remember or not remember how you sort certain folders, edit what's accessible through the right-click menu, or de-hook Windows Media Player from all the files it tries to glom onto, Xdn does those things for Windows 7.

Switch Power Management Plans With a Hotkey: Once you've created the shortcut, you can assign a hotkey in the properties dialog—even better, put the shortcut in a location to be indexed by Launchy or the Vista start menu search, or even add it to your AutoHotkey automation script.

VistaSwitcher is an Absolutely Awesome Alt-Tab Replacement: It's a little difficult to showcase how well this thing works with just a screenshot, but you can see the partially transparent Alt-Tab switcher window, complete with a massive preview window and the window titles easily readable.

Windows 7 Recovery Discs Gets Your System Out of Tight Spots: Boot your system from NeoSmart's CD, and you'll get a stripped-down Windows system with a window offering startup file repair, Restore Point returns, recovery from a whole-cloth image, memory testing, and a command prompt for those dire moments when only frantically Google-d terminal instructions can save you.

We hope you found at least one link in that rather large list that helps you get settled into your new OS. Did we miss anything? Got a favorite tip or link you feel Windows 7 newcomers should consider? Share it in the comments.